Method and apparatus for recording management information on a recording medium and the recording medium

ABSTRACT

The write-once recording medium has a data structure for managing temporary defect management areas, TDMAs, of the recording medium, where each TDMA is for at least storing temporary defect management information. In one embodiment, the recording medium includes a TDMA access indicator, TAI, area for selectively storing data indicating which one of the TDMAs is currently in use.

FOREIGN PRIORITY INFORMATION

This application claims the benefit of the Korean Patent Application No.10-2004-0041844, filed on Jun. 8, 2004, the entire contents of which arehereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to write-once recording media, and moreparticularly, to a method and an apparatus for recording managementinformation on a write-once recording medium and the recording medium.

2. Discussion of the Related Art

An optical disc has been widely used as an optical recording medium torecord large amounts of data. Recently, a blu-ray disc (BD) has beenintroduced as a high density digital video disc (HD-DVD) for recordinghigh definition video data and superior sound quality audio data.

The BD has been spotlighted as a next generation of HD-DVD and as a nextgeneration optical recording solution for storing more data than aconventional DVD.

Accordingly, various specifications of the BD have been standardizedincluding a rewritable blu-ray disc (BD-RE) and a write once blu-raydisc (BD-WO).

FIG. 1 is a diagram showing a structure of a recording area in arewritable blu-ray disc (BD-RE) in accordance with the prior art.Particularly, FIG. 1 shows a recording area structure of a disc having asingle layer.

The rewritable blu-ray disc (BD-RE) is divided into a lead-in area, adata area and a lead-out area from an inner circumference of the blu-raydisc. The data area is further divided to an inner spare area (ISA), auser data area and an outer spare area (OSA). The ISA is arranged at aninner circumference of the data area and the OSA is arranged at an outercircumference of the data area for replacing defective areas in the dataarea. User data is recorded in the user data area.

During the recording of data on the BD-RE having the above mentionedstructure, a surface of the BD-RE may be damaged or polluted by variousfactors. As a result, defect areas are generated. If the defect area isgenerated during recording data, data recorded in the defect area istransferred to spare areas such as the ISA and the OSA.

When transferring data to the spare areas, management information of thedefect area is recorded in a defect management area (DMA) of the lead-inarea or the lead-out area. The defect management area is shown in FIG. 1as DMA1 to DMA4. The management information of a defect area includeslocation information of the defect area and the spare area where thedata of the defect area is recorded.

A minimum recording unit of the BD is a cluster. A single clusterincludes 32 sectors and a single sector includes 2048 bytes.

Since data can be rewritable at the any location in the BD-RE, data maybe recorded at random locations without consideration of a recordingmethod. The management information also can be rewritable in the DMA.Accordingly, the defect area can be sufficiently managed with a smallDMA by using a method of updating the management information in the DMA.That is, 32 clusters generally are allocated to each DMA of the BD-RE.

In case of a write once disc, data may only be recorded one time inrecording areas of the write once disc. Accordingly, recording data islimited by the recording method. Therefore, defect management has becomea major factor in a high density write once disc such as the write onceblu-ray disc (BD-WO).

The defect management area is required in the write once disc forrecording defect management information and disc use state information.A defect management method of the write once disc becomes morecomplicated compared to the rewritable disc because of the write oncecharacteristic. However, a unified standard supporting the abovementioned requirements of the write once disc is not completelystandardized and thus an effective management method has been in greatdemand.

SUMMARY OF THE INVENTION

The present invention relates to a recording medium having a datastructure for managing a write-once recording medium.

In one embodiment, the write-once recording medium has a data structurefor managing temporary defect management areas, TDMAs, of the recordingmedium, where each TDMA is for at least storing temporary defectmanagement information. In this embodiment, the recording mediumincludes a TDMA access indicator, TAI, area for selectively storing dataindicating which one of the TDMAs is currently in use.

In one embodiment, the recording medium includes TDMA0 to TDMAn forstoring temporary defect management information, and the TAI areaincludes a sub-area corresponding to each one of TDMA1 to TDMAn,respectively. Each sub-area includes data if the corresponding TDMA hasbeen used.

The sub-area including data that corresponds to a highest numbered TDMAindicates that the highest numbered TDMA is the TDMA currently in use.

For example, if a TDMA has been used, the corresponding sub-areaincludes a first temporary disc definition structure, TDDS, which isrecorded in the TDMA. The TDDS includes at least one pointer toinformation in the TDMA.

As another example, if a TDMA has been used, the corresponding sub-areaincludes a plurality of copies of a first temporary disc definitionstructure, TDDS, which is recorded in the TDMA.

Furthermore, in an embodiment, the sub-area including data thatcorresponds to the highest numbered TDMA further indicates that lowernumbered TDMAs have been completely used.

In one embodiment, the sub-areas are clusters. Accordingly, if a TDMAhas been used, the corresponding cluster may have a first sector storinga first temporary disc definition structure, TDDS, which is recorded inthe TDMA. Or, if a TDMA has been used, each sector of the correspondingcluster includes a first temporary disc definition structure, TDDS,which is recorded in the TDMA.

In one embodiment, the clusters are clusters of the TDMA0. For example,the clusters corresponding to TDMAn to TDMA1 may be a second to (n+1)thcluster of the TDMA0.

In another embodiment, the TAI area also includes a first cluster of theTDMA0, and the first cluster indicates whether the recording medium isclosed. For example, the first cluster indicates that the recordingmedium is closed if the first cluster includes data. In one embodiment,if the recording medium is closed, a first sector of the first clusterincludes the defect data structure, DDS, recorded in a defect managementarea, DMA. In another embodiment, if the recording medium is closed,each sector of the first cluster includes the defect data structure,DDS, recorded in a defect management area, DMA.

In a further embodiment, the TAI area indicates which of the TDMAs arecompletely used.

In a still further embodiment, the TAI area indicates whether therecording medium is closed.

The present invention further provides apparatuses and methods forrecording and reproducing according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 illustrates a recording area structure of a rewritable blu-raydisc (BD-RE) in accordance with a prior art;

FIGS. 2A and 2B illustrate a structure of an optical write once disc anda method for recording management information in accordance with anembodiment of the present invention;

FIGS. 3A to 4C illustrate a method for TAI indicating whether TDMA andDMA are used in accordance with an embodiment of the present invention;

FIG. 5A illustrates various disc defect management information recordedin a TDMA and temporary disc management structure (TDMS) informationrepresenting a disc use state in accordance with an embodiment of thepresent invention;

FIG. 5B illustrate a structure of a TDDS among TDMS according to anembodiment of the present invention;

FIG. 6 illustrate a method for recording TDDS in TAI according to anembodiment of the present invention;

FIGS. 7A and 7B illustrates a structure of management informationrecorded in a DMA according to an embodiment of the present inventionwhen a disc is closed;

FIGS. 8A to 8D illustrate management information recorded in TAI and DMAaccording to an embodiment of the present invention when a disc isclosed;

FIG. 9 illustrate an optical disc recording/reproducing apparatus inaccordance with an embodiment of the present invention; and

FIGS. 10 to 12 illustrate a method for recording management informationof an optical write once disc in accordance with an embodiment of thepresent invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

Reference will now be made in detail to example embodiments of thepresent invention, which are illustrated in the accompanying drawings.Wherever possible, the same reference numbers will be used throughoutthe drawings to refer to the same or like parts.

FIGS. 2A to 2B are diagrams illustrating a structure of an optical writeonce disc and a method for recording management information inaccordance with an embodiment of the present invention. FIG. 2A shows asingle layer disc having one recording layer and FIG. 2B shows a duallayer disc having two recording layers.

The single layer disc having one recording layer of FIG. 2A is dividedinto a lead-in area, a data area and a lead-out area from an innercircumference of the blu-ray disc. The data area is further divided intoan inner spare area (ISA), a user data area and an outer spare area(OSA). The ISA is arranged at inner circumference of the data area andthe OSA is arranged at outer circumference of the data area forreplacing a defect area in the data area. User data is recorded in theuser data area.

In contrarst with a rewritable optical disk, the optical write once discincludes a plurality of temporary disc management area (TDMA) besides aplurality of disc management areas (DMA) because of the characteristicsof the optical write once disc.

The DMA of FIG. 1 is used for defect area management, but the DMAs ofFIGS. 2A and 2B are used to record final management information when adisc is closed in the BD-WO (Blu-ray write-once disc). The finalmanagement information includes not only the defect managementinformation, but also a recording state of the disc. Therefore, in theBD-WO, it is defined as the disc management area (DMA).

Also, the TDMA is an area where the disc management information isupdated before disc closing. The TDMA is classified into two types: aTDMA0 area and a TDMA1 area. The TDMA0 is located in the lead-in areaand has a fixed size of 2048 physical clusters. The TDMA1 is located inthe outer spare area (OSA) and has a variable size, which variesaccording to a size of the OSA.

The TDMA0 may be defined as necessary disc management area and the TDMA1may be defined as alternative or optional disc management area. It ispossible to decide the size of TDMA1 when a corresponding area isallocated to the TDMA1. Preferably, ¼ of the spare area is allocated tothe TDMA1. Accordingly, a size of the TDMA1 is P=N*256/4 cluster,wherein P is a size of the TDMA1 and N is the number of sectors in thespare area containing the TDMA1.

Also, the plurality of TDMAs are used according to a predeterminedorder. That is, the TDMA0 may be firstly used and the TDMA1 may thenused. Identification numbers of TDMAs may be assigned based on the orderof using the TDMAs.

In the present embodiment, management information for managing theplurality of TDMAs and the DMA may additionally be recorded in a frontpart of the TDMA0.

The management information provides information indicating which TDMA iscurrently used. This information may be accessed when an optical disc isloaded in a recording/reproducing apparatus. Accordingly, the finaldefect management information and the disc use state information areeasily reproduced at initial access. Thus, an initial access time isreduced.

Furthermore, the disc closing can be confirmed by using the managementinformation. This will be explained in later.

Information related to accessing a currently used TDMA may be defined asa TDMA access indicator (TAI) information in the present embodiment. TheTAI information may be expressed using a first two clusters among the2048 clusters of the TDMA0. The area of the first two clusters isreferred to as TAI area in the present embodiment.

FIG. 2B shows a structure of a dual layer disc having two recordinglayers. The dual layer disc includes a first recording layer layer0 anda second recording layer layer1. The first recording layer includes alead-in area as a management area of an outer circumference area, a dataarea and an outer area 0. The lead-in area may be called an inner area.The data area of the first recording layer layer0 includes an innerspare area ISA0, a user data area and an outer spare area OSA0. Also,the second recording layer includes a lead-out area as a management areaof an outer circumference area, a data area and an outer area 1. Thelead-out area of the second recording layer may also be called an innerarea. The data area of the second recording layer includes an innerspare area ISA1, a user data area, and an outer spare area OSA1.

The write once dual layer optical disc of FIG. 2B also includes aplurality of temporary disc management areas TDMAs beside a discmanagement area (DMA) to provide areas for recording various discmanagement information. In FIG. 2B, the temporary disc management areasare shown as TDMA0, TDMA1, TDMA2 and TDMA3.

The TDMA0 and TDMA1 in the inner areas may have a fixed size 2048clusters and the TDMA2, TDMA3, TDMA4 in the spare areas OSA0, OSA1, ISA1may have a variable size, which varies according to a size of the sparearea. As mentioned above, the size of the TDMA2, TDMA3, TDMA4 may be ¼of the spare area. Accordingly, a size of the TDMA2 and the TDMA3 may beP=N*256/4 and a size of the TDMA4 may be Q=L*256/4, wherein P is thesize of the TDMA2 and TDMA3, N is the number of sectors of the sparearea, Q is the size of the TDMA4 and L is the number of sectors of theISA1.

The plurality of TDMAs may be used according to a predetermined useorder. For example, the TDMA0 may be firstly used and the TDMA1 may bethen used. That is, the identification numbers of the TDMAs may beassigned based on the order of using the TDMAs.

In the dual layer disc of the present embodiment, management informationfor managing the plurality of TDMAs is recorded in a front part of theTDMA0. It is very helpful to provide information on which TDMA iscurrently used. As mentioned above, the final defect managementinformation and the disc use state information are easily reproduced atan initial access time by providing the information indicating thecurrently used TDMA. Thus, an initial access time is reduced.

Similar to the single layer disc, information for easy access of thecurrently used TDMA and representing disk closing is referred to as TDMAaccess indicator (TAI) information in the dual layer disc of the presentembodiment. In the dual layer disc, the TAI information may be providedby the first five clusters among the 2048 clusters in the TDMA0.Therefore, an area of the first five clusters is referred to as a TAIarea.

According to the predetermined use order of the TDMAs, temporary discmanagement structure (TDMS) information is first updated at the TDMA0.When the space of the TDMA0 is completely occupied by the updating ofthe TDMS information, the TDMS information is then updated in the TDMA1.A method for providing the TAI information indicating which TDMA iscurrently used and whether the disc is closed or not and a method forrecording the TAI information will be explained hereinafter withreference to FIGS. 3A and 3B.

FIG. 3A is a diagram showing a method for recording a TDMA accessindicator (TAI) in case of single layer disc according to an embodimentof the present invention, and FIG. 3B is a diagram showing a method ofrecording a TDMA access indicator (TAI) in case of dual layer discaccording to an embodiment of the present invention.

In case of the single layer disc having one recording layer as shown inFIG. 3A, the TAI is provided by using the first two clusters among theclusters in the TDMA0. That is, the TAI includes two clusters forindicating whether the disc is closed or not and indicating which TDMAis currently used.

One of the two clusters is used as a DMA disc closing indicator forindicating whether the disc is closed or not, and other cluster is usedas a TDMA1 in use indicator representing whether the TDMA1 is currentlyused.

As mentioned above, the single layer disc in this embodiment includes amaximum of two TDMAs (TDMA0 and TDMA1). The TAI information requires onecluster for managing the TDMAs in the single layer disc. If the TDMA1indicator cluster is not recorded in the TAI, it represents that theTDMA0 is currently used, and if the TDMA1 indicator cluster is recordedin the TAI, it represents that the TDMA1 is currently used.

In other words, when the optical recording apparatus firstly uses theTDMA0 and the TDMA0 is fully occupied with the updated information, theoptical recording apparatus records the TDMA1 indicator in the TAI forrepresenting that the TDMA1 is currently used.

For example, if there is not recorded a TDMA1 indicator in the TAI(unrecorded) as shown in FIG. 4A, it represents that the TDMA0 iscurrently used.

Recording the TDMA1 indicator in the TAI may be achieved by recordingany data in the corresponding cluster. Meaningless dummy data may berecorded in the corresponding cluster in the TAI or real data such asthe TDDS may be recorded in the corresponding cluster.

In the present embodiment, the most recent TDDS included in therecording/reproducing apparatus is recorded in one of the clusters inthe TAI as the TDMA1 indicator instead of dummy data. Also, a first TDDSof the corresponding TDMA may be recorded in one of clusters in the TAIas the TDMA1 indicator. The TDDS has a size of 1 sector and is recordedin a last sector of the TDMS.

Accordingly, only one sector is occupied by the TDDS and the other 31sectors may be occupied by dummy data when the TDDS is recorded in theTAI. However, as another alternative the TDDS is repeatedly recorded inall 32 sectors of the cluster in the TAI for increasing robustness ofreading the TDDS. Detailed explanation of the TDMS and the TDDS will beprovided in later.

If the TDDS is repeatedly recorded in a cluster of the TAI, therecording/reproducing apparatus can simultaneously read the TDDS duringconfirming a recording state of the TAI in disc initialization.Therefore, the recording/reproducing apparatus can rapidly find the TDMAwhere the most recent TDMS is recorded.

As mentioned above, the DMA indicator indicates whether the opticalwrite once disc is closed or not.

The disc closing is a state of the disc representing that no more datacan be recorded in the disc. The optical write once disc is closed whenthe disc does not have any more space where the data may be recorded orwhen desired by the host. After the optical write once disc is closed,the optical write once disc becomes a read-only disc. That is, it is notpermitted to record any more data in the optical write once disc. Thedisc closing is also called as a finalized disc.

If the optical disc is closed, that is, if the optical disc isfinalized, the optical recording/reproducing apparatus transfers themost recent management information recorded in the TDMA to a DMA areaand a cluster of the DMA indicator in the TAI is changed to a state forrepresenting the closed disc.

Accordingly, the TAI is used as not only information indicating thecurrently used TDMA but also information representing that the disc isclosed.

Data recorded in the cluster of the DMA indicator may be the recent TDDSinformation or the DDS information recorded in the DMA. This will beexplained later in detail.

FIG. 3B shows a method for recording the TAI in a write once dual layerdisc having two recording layers in accordance with an embodiment of thepresent invention.

The TDMA of the dual layer disc may include, in this embodiment, amaximum of five TDMAs (TDMA0 to TDMA4) as mentioned above. Therefore,the TAI information requires fours clusters for managing the five TDMAsas shown in FIG. 3B. Additionally, the TAI further includes one clusterfor a DMA indicator.

If the TDMA1 indicator through the TDMA4 indicator are not recorded inthe TAI, the TAI represents that the TDMA0 is currently used. If theTDMA1 indicator, but not the TDMA2 through TDMA4 indicator, is recordedin the TAI, the TAI represents that the TDMA1 is currently used and theTDMA0 is fully occupied.

Similarly, if the TDMA2 indicator, but not the TDMA3 through TDMA4indicator is recorded in the TAI, this represents that the TDMA2 iscurrently used and the TDMA is fully occupied (as is the TDMA0). Also,the TDMA1 indicator will have been recorded. If the TDMA3 indicator, butnot the TDMA4 indicator, is recorded in the TAI, this represents thatthe TDMA3 is currently used and the TDMA2 is fully occupied (as is theTDAM1 and TDMA0). Also, the TDMA2 and TDMA1 indicators will have beenrecorded. Moreover, if the TDMA4 indicator is recorded in the TAI, thisrepresents that the TDMA4 is currently used and the TDMA3 is fullyoccupied (as is the TDMA2-TDM0). Also, the TDMA1-TDMA3 indicators willhave been recorded.

Stated another way, a TDMA indicator indicates that the correspondingTDMA has been used. Therefore, the TDMA indicator having been recordedand corresponding to the highest numbered TDMA indicates the TDMAcurrently being used. This also indicates that the lower numbered TDMAsare completely used.

For example, if the TDMA1 indicator and the TDMA2 indicator are recordedin two clusters of the TAI as shown in FIG. 4B, this represents that theTDMA2 is currently used. The TDMA indicators are recorded in theclusters of the TAI in a reverse order of physical sector numbers of theclusters. That is, a lowest number of TDMA indicator occupies highestphysical sector number of the clusters allotted to the TAI. By recordingthe TDMA indicators in the reverse order of the physical sector numbersof the clusters, interference with an optimum power calibration (notshown), which is neighbored to the TDMA0, may be avoided.

When the optical write once disc is loaded in the opticalrecording/reproducing apparatus, a location of a currently used TDMA canbe detected based on the TAI. Thus, the most recently recorded TDMSinformation can be read from the detected TDMA. That is, initialinformation can be rapidly obtained for reproducing.

If the TAI does not exist, the optical recording/reproducing apparatusfinds the currently used TDMA by scanning TDMAs from the TDMA0.Accordingly, the optical recording/reproducing apparatus may spend lotsof time trying to find the currently used TDMA. Such a problem isovercome by the TAI.

In the present embodiment, respective temporary disc definitionstructure (TDDS) information may recorded in the clusters of therespective TDMA1 indicator to TDMA4 indicator instead of recording dummydata to indicate the currently used TDAM. Accordingly, the opticalrecording/reproducing apparatus can simultaneously read the TDDSinformation while confirming a recording state of the TAI. Therefore,the optical recording/reproducing apparatus can rapidly find the TDMAarea where the recent TDMS information is recorded.

Meanwhile, in case of the dual layer disc, one cluster of the TDMA0 isallocated to the DMA indicator for indicating the disc closing state ofthe optical write once disc.

For example, if all TDMA indicators including the TDMA1 indicator to theTDMA4 indicator are recorded in the TAI area as shown in FIG. 4C, thisrepresents the optical write once disc is closed. That is, no more datacan be recorded in the write once disc and the write once disc can beread only.

FIG. 5A is a diagram showing various disc defect management informationand disc use state information recorded in a TDMA in accordance with anembodiment of the present invention.

As shown in FIG. 5A, the above mentioned temporary disc managementinformation structure (TDMS) information is recorded in the TDMAexcepting the TAI area.

The TDMS information is disc management information. The TDMSinformation is recorded in more than one cluster, which is basic unit ofrecording. Various information may be included in the TDMS information.Therefore, the various information may be modified or additionallyincluded according to specifications of the write once disc to bestandardized. For example, the TDMS information may be includeinformation as described below.

At first, the disc defect management information may include a temporarydefect list TDFL, and disc use state information such as sequentialrecording range information (SRRI) applied to a sequential recordingmode or a space-bit map (SBM) applied to a random recording mode. In oneor plural clusters of the last sector, a temporary disc definitionstructure (TDDS) is recorded in the present embodiment. The TDDSincludes location information indicating the most recent versions ofTDMS information such as the TDFL, the SRRI (or the SBM) and variousadditional information.

The TDDS is an area including general recording/reproducing information.As described above, pointer information indicating the most recentversion (last updated) of the TDFL and SRRI (or SBM) is included in theTDDS. The TDDS is generally first confirmed when the disc is loaded inthe optical recording/reproducing apparatus.

The information included in the TDDS is continuously updated accordingto a use state of the disc. Accordingly, the information of the TDDS isrecorded in the last sector of the TDMA. Therefore, various managementinformation according to current use of the disc may be confirmed byreading the last TDDS.

FIG. 5B shows a detail structure of the TDDS.

As shown in FIG. 5B, the TDDS includes a TDDS identifier field and aTDDS format field for indicating the characteristics of the TDDS; a TDDSupdate count field for providing the number of TDDS updates; a first PSNof drive area field for indicating a currently used drive area forrecording various drive information; a first PSN of defect list fieldfor expressing a first physical sector number of a defect list when thedisc is closed; a location of LSN O of user data area field and a lastLSN of user data area field for representing a beginning and an end ofthe user data area; an inner spare area 0 size field and an outer sparearea size field for expressing a size of the spare area; a spare areafull flags field for expressing whether the spare area is full or not,and a recording mode field for representing a disc recording mode suchas a sequential or a random; a general flag bits field for representingwhether the disc is write-protected or not; inconsistency flags forexpressing an update state of the TDMS; a last recorded address of userdata area field for indicating a location of the last recorded data inthe user data area; a size of TDMAs in outer spare area field and a sizeof TDMA in inner spare area 1 field for representing a size of TDMAallocated in the spare area; a first PSN of 1^(st) cluster of defectlist field, for representing a first physical sector number of the lastdefect list in the recent TDMA area, to a first PSN of 8^(th) cluster ofdefect list field, for representing a 8^(th) physical sector number ofthe last defect list in the recent TDMA area, wherein the number ofdefect list does not exceed a maximum of 4 in a single layer disc andmaximum of 8 in double layer disc; a first PSN of SRRI/SBM for L0 fieldand a first PSN of SBM for L1 field for representing a location of thelast recorded SRRI or SBM according to each mode in a sequential or arandom recording mode; a next available PSN of ISAO field, a nextavailable PSN of OSAO field, a next available PSN of ISAI field and anext available PSN of OSAI field for representing next usable physicalsector number in the spare area; a year/month/data of recording fieldfor representing recording time; and a drive ID field for representing amanufacturer, an additional ID and a serial number.

The TDDS information including the above mentioned information isupdated whenever corresponding information forming the TDDS is updatedand the last updated TDDS information becomes the informationrepresenting the most recent state of the disc.

If the disc is closed, the latest TDDS is copied as the DDS into theDMA. But, a value of the first PSN of defect list field is recorded withan original value when the latest TDDS is copied.

That is, the value of the first PSN of defect list field in the recordedTDDS may have “00h” before the disc closing. But, after the discclosing, a meaningful value is assigned in the first PSN of the defectlist field. This will be explained in detail with reference to FIG. 7B.

FIG. 6 is a diagram showing a method for recording data in a TDMAindicator cluster in a TAI area. The TDMA indicator may be expressed byrecording dummy data in the corresponding cluster in the TAI area.However, in the present embodiment, the TDMA indicator is expressed inthe TAI area by recording meaningful data in the corresponding clusterin the TAI instead of the dummy data for providing more information.

In the TAI area, each TDMA indicator cluster indicates whether anassociated TDMA as a currently used TDMA. In the present embodiment, theTDDS information firstly recorded in the corresponding TDMA is recordedin the corresponding TDMA indicator cluster in the TAI area.

Accordingly, if the optical recording/reproducing apparatus confirms thecorresponding TAI area from the loaded disc, it is possible to detectwhich TDMA is current used from the TAI and to read various informationsuch as allocation of spare area and a size of allocated spare area thatare usually recorded in the TDDS in the present embodiment.

The optical recording/reproducing apparatus may then read the latestrecorded TDDS from the corresponding TDMA area and obtain the pointerinformation for the latest recorded TDFL and the SRRI(or SBM) from thelatest recorded TDDS. Then, the optical recording/reproducing apparatusmay confirm entire recording state of the disc and defect area byreading the latest TDFL and the SRRI(or SBM) recorded in thecorresponding area.

FIG. 7A to FIG. 8D show various methods for recording the DMA or TAIinformation when the disc is closed. A single layer disc is used as anexample for explaining the present embodiment. However, it will bereadily apparent to those skilled in the art from this disclosure thatthese examples may be applied to a dual layer disc.

As describe above, when the disc is closed, no more data can be recordedin the disc and the disc becomes a read-only disc. Accordingly, the useof a TDMA is prohibited and the latest TDMS information among themanagement information is copied to the DMA area.

The disc may be forced closed by the host or the disc may beautomatically closed when there is no area left for recording data inthe user data area or the TDMA area.

FIG. 7A is a diagram showing a disc structure when the disc is closed.Specially, a structure of management information recorded in the DMA isshown in FIG. 7A. For convenience of explaning the present embodiment, asingle layer disc is used as the example.

That is, when the disc is closed, identical management information isrecorded in four DMA (DMA1 to DMA4) in the disc. Each DMA includes 32clusters. The DDS and the SSRI (or SBM) are four times repeatedlyrecorded in the four clusters 1 to 4. That is, the DDS is recorded in afirst sector of the cluster 1 in each DMA. When the disc is closed, thelatest TDDS information is copied in the first sector of the cluster 1.But, a location information of the valid DFL recorded in thecorresponding DMA is recorded in the first PSN of defect list fieldamong the TDDS information.

As shown in FIG. 7B, basically, the DDS has a similar structure to theTDDS except for the value of the first PSN of defect list field. This isbecause the first PSN of defect list field indicates a 1^(st) positionof the DFL in each DMA1, DMA2, DMA3 and DMA4.

Accordingly, the value of the first PSN of defect list field is “00h” inthe TDDS structure shown in FIG. 5B and the first PSN of defect listfields in the DMA1, DMA2, DMA3, DMA4 have different unique positionvalues.

The latest SRRI (or SMB) and the TDFL information recorded in the eachTDMA are copied to the DMA as the SRRI (or SBM) and the DFL of the DMA.Specially, an area where the DFL is recorded includes a total or 28clusters from a cluster 5 to a cluster 32. Four clusters are gathered asone group so that identical DFL information is recorded 7 times. Also,according to a system, it is possible to record the DFL in clusters 5 to8 and dummy data is repeatedly recorded in the clusters 9 to 32.

FIGS. 8A and 8B are diagrams for showing a method for recording DMA andTAI when a disc is closed according to a first embodiment of the presentinvention.

When the disc is closed, a state of the DMA indicator cluster in the TAIis changed by being recorded in for representing the disc closing state.In the DMA indicator cluster, dummy data may be recorded. However, Inthe present embodiment, meaningful data is recorded in the DMA indicatorcluster for not only representing the disc closing state but also fortransferring the meaningful data. Also, when the disc is closed,management information having a data structure shown in FIG. 7A isrecorded in the each DMA.

As shown in FIG. 8A, the latest TDDS information may be recorded in theDMA indicator cluster of the TAI according to the present embodiment.

That is, for closing the disc, the latest TDDS information is recordedin the DMA indicator cluster in the TAI and identical DSS/SRRI(orSMI)/DFL are recorded in four DMAs. Among the DDS information, only thefirst PSN of defect list fields have different values from the TDDS. Forshowing the four different values of the first PSN of defect listfields, DDS1 to DDS4 are shown in FIG. 8A.

FIG. 8B shows information recorded in the DMA indicator clusteraccording to the FIG. 8A. The latest TDDS information recorded in theDAM indicator cluster may be recorded in one sector, and the DMAindicator cluster includes 32 sector. Therefore, the latest TDDS mayalso be repeatedly recorded in the 32 sectors of the DMA indicatorcluster. But, according to a system, the latest TDDS may be recorded inone sector and dummy data may be recorded in the other sectors. Or thelatest TDDS may be repeatedly recorded in predetermined sectors.

Accordingly, when the closed disc is loaded into the opticalrecording/reproducing apparatus, the optical recording/reproducingapparatus confirms whether the DMA indicator cluster is recorded or notto determine whether the disc is closed or not. At the same time, theoptical recording/reproducing apparatus obtains useable information fromthe latest TDDS information recorded in the DMA indicator cluster in theTAI. Then, the optical recording/reproducing apparatus checks the finaldisc defect list (DFL) and the recording state information SRRI and SBMby reading data recorded in the DMA area.

FIGS. 8C and 8D are diagrams showing a method of recording the DMA andthe TAI when the disc is closed according to a second embodiment of thepresent invention. Specially, the DDS information is recorded in the DMAindicator cluster in the TAI in the second embodiment of the presentinvention.

For performing the disc closing, identical DDS/SSRI(or SBM)/DFL isrecorded in four DMA areas. Only the first PSN of defect list fieldshave different values among the DDS information. For convenience, theyare shown as DDS1 to DDS4.

One of the DDS information is recorded in the DMA indicator cluster inthe TAI for changing a recording state of the corresponding cluster. Therecorded DDS information may be one of the DDS1 to DDS4 or the DDS1 isrecorded by default.

FIG. 8D shows information recorded in the DMA indicator clusteraccording to FIG. 8C. The DSS information recorded in the DMA indicatorcluster may be recorded in one sector. The DMA indicator clusterincludes 32 sectors. Therefore, the DSS information may also berepeatedly recorded in the 32 sectors of the DMA indicator cluster asshown in FIG. 8D. But, according to a system, the DSS information may berecorded in one sector and dummy data may be repeatedly recorded in theother 31 sectors. Or, the DSS information may be repeatedly recorded inselected sectors in the DMA indicator cluster.

Accordingly, when the closed disc is loaded in the opticalrecording/reproducing apparatus, the optical recording/reproducingapparatus confirms whether the DMA indicator cluster is recorded or notto determine whether the disc is closed or not. At the same time, theoptical recording/reproducing apparatus obtains useable information fromthe final DDS information recorded in the DMA indicator cluster in theTAI. Then, the optical recording/reproducing apparatus checks the finaldisc defect list (DFL) and the recording state information SRRI and SBMby reading data recorded in the DMA area.

The type of information to be recorded in the DMA indicator cluster inthe TAI when the disc is closed may be standardized to one ofembodiments as shown in FIGS. 8A and 8C for compatability betweenoptical recording/reproducing apparatuses in order to effectively usethe information recorded in the DMA indicator cluster.

FIG. 9 is a block diagram illustrating an optical recording/reproducingapparatus in accordance with an embodiment of the present invention. Asshown in FIG. 9, the optical recording/reproducing apparatus includes arecording/reproducing unit 10 for recording data on a disc andreproducing the recorded data and a controlling unit (or host) 20 forcontrolling the recording/reproducing unit 10.

The controlling unit 20 transfers a command for recording data on apredetermined area or a command for reproducing recorded data. Therecording/reproducing unit 10 records data on a predetermined area orreproduces the recorded data based on the transferred command from thecontrolling unit 20. The recording/reproducing unit 10 is generallycalled an optical drive.

The recording/reproducing unit 10 includes an interfacing unit 12 forcommunicating with an external device; a pickup unit 11 for recording orreproducing data on the optical disc; a data-processor 13 for receivinga reproduced signal from the pickup unit and converting the receivedreproduced signal to a target signal value, or modulating a signal to berecorded in the optical disc and transferring the modulated signal tothe pickup unit 11; a servo unit 14 for controlling the pickup unit 11in order to accurately record a signal to the optical disc; a memory 15for temporally storing various information and data; and a microcomputer16 for controlling the above mentioned elements of therecording/reproducing unit

Hereinafter, a method for recording/reproducing the TAI information anda method for closing a disc in the optical recording/reproducingapparatus in accordance with an embodiment of the present invention willbe explained in detail.

When a disc is loaded in the optical recording/reproducing apparatus,the optical recording/reproducing apparatus confirms a recording stateof the TAI of the loaded disc for determining whether the loaded disc isclosed or not and detecting a position of a currently used TDMA.

If the disc is not closed yet, the microcomputer 16 obtains thecurrently used TDMA from the TAI information, reads the latest TDMSinformation in the currently used TDMA and reads the disc recordingstate and the defect information from the latest TDMS information. Themicrocomputer 16 also notifies the controlling unit 20 that the loadeddisc is not closed. Then, if a command for recording or reproducing datais input from the controlling unit 20, the recording/reproducing unit 10records data or reproduce data in a target area.

In performing recording, the microcomputer 16 updates the TDMS in theTDMA area based on any well-known method. If a predetermined TDMA(k) isfully occupied by updating, the microcomputer 16 uses another TDMS(k+1)to update the TDMS. When the TDMS is firstly updated in the TDMA(k+1),the first TDDS information recorded in the TDMA(k+1) is recorded in theTDMA(k+1) indicator cluster in the TAI area.

When the disc is closed, predetermined information is recorded in theDMA indicator cluster in the TAI and the DMA area based on one ofmethods shown in FIG. 8A or 8C, which is decided as a standard forrepresenting the loaded disc is closed.

If the loaded disc is a closed disc, the microcomputer 16 reads thefinal recording state and the defect information from informationrecorded in the DMA indicator cluster in the TAI and the DMA area. Andthen, the microcomputer 16 notifies the controlling unit 20 that theloaded disc is the closed disc and performs reproducing data accordingto a control of the controlling unit 20.

Hereinafter, a method for recording management information of a disc inaccordance with an embodiment of the present invention will be explainedwith reference to FIGS. 10 to 12.

FIGS. 10 to 12 are flowcharts illustrating a method of recordingmanagement information of a disc in accordance with an embodiment of thepresent invention.

As shown in FIG. 10, TDMS is recorded in a TDMA according to datarecorded in the disc before disc closing at step S10.

A recording state of a TDMA indicator cluster is changed forrepresenting a position of a currently used TDMA among a plurality ofTDMAs at step S20.

When the disc is closed, a recording state of a cluster indicating thedisc closing is modified at step S40 and the latest TDMS recorded in theTDMA is recorded in the DMA at step S50.

As shown in FIG. 11, the latest TDDS may be recorded in the clusterindicating the disc closing at step S40 and the latest TDDS may berecorded in plural of the DMAs as the DDS information at the step S50.

Also, as shown in FIG. 12, the latest TDDS may be recorded in plural ofthe DMAs during the disc is closing at step S40 and the DDS informationis recorded in the cluster indicating the disc closing at step S50.

While the invention has been disclosed with respect to a limited numberof embodiments, those skilled in the art, having the benefit of thisdisclosure, will appreciate numerous modifications and variations therefrom. For example, while described with respect to a Blu-ray write-onceoptical disk in several instances, the present invention is not limitedto this standard of write once optical disk or to write-once opticaldisks. Instead, the embodiments of the present invention may findapplication to other write-once recording media. It is intended that allsuch modifications and variations fall within the spirit and scope ofthe invention.

1. A write-once recording medium having a data structure for managingtemporary defect management areas, TDMAs, of the recording medium, eachTDMA for at least storing temporary defect management information, therecording medium comprising: a TDMA access indicator, TAI, area forselectively storing data indicating which one of the TDMAs is currentlyin use.
 2. The recording medium of claim 1, wherein the TAI areaincludes at least one portion associated with a TDMA and selectivelystoring data indicating whether the associated TDMA has been used. 3.The recording medium of claim 1, further comprising: TDMA0 to TDMAn forstoring temporary defect management information; and wherein the TAIarea includes a sub-area corresponding to each one of TDMA1 to TDMAn,respectively, each sub-area including data if the corresponding TDMA hasbeen used.
 4. The recording medium of claim 3, wherein the sub-areaincluding data that corresponds to a highest numbered TDMA indicatesthat the highest numbered TDMA is the TDMA currently in use.
 5. Therecording medium of claim 4, wherein if a TDMA has been used, thecorresponding sub-area includes a first temporary disc definitionstructure, TDDS, which is recorded in the TDMA, the TDDS including atleast one pointer to information in the TDMA.
 6. The recording medium ofclaim 4, wherein if a TDMA has been used, the corresponding sub-areaincludes a plurality of copies of a first temporary disc definitionstructure, TDDS, which is recorded in the TDMA, the TDDS including atleast one pointer to information in the TDMA.
 7. The recording medium ofclaim 4, wherein the sub-area including data that corresponds to thehighest numbered TDMA further indicates that lower numbered TDMAs havebeen completely used.
 8. The recording medium of claim 3, wherein thesub-areas corresponding to higher numbered TDMAs have smaller addressesthan sub-areas corresponding to lower numbered TDMAs.
 9. The recordingmedium of claim 3, wherein the sub-areas are clusters.
 10. The recordingmedium of claim 9, wherein if a TDMA has been used, the correspondingcluster has a first sector storing a first temporary disc definitionstructure, TDDS, which is recorded in the TDMA, the TDDS including atleast one pointer to information in the TDMA.
 11. The recording mediumof claim 10, wherein if a TDMA has been used, each sector of thecorresponding cluster includes a first temporary disc definitionstructure, TDDS, which is recorded in the TDMA.
 12. The recording mediumof claim 3, wherein the sub-areas are clusters of the TDMA0.
 13. Therecording medium of claim 12, wherein the sub-areas corresponding toTDMAn to TDMA1 are a second to (n+1)th cluster of the TDMA0.
 14. Therecording medium of claim 13, wherein the TAI area includes a firstcluster of the TDMA0, and the first cluster indicates whether therecording medium is closed.
 15. The recording medium of claim 14,wherein the first cluster indicates that the recording medium is closedif the first cluster includes data.
 16. The recording medium of claim15, wherein if the recording medium is closed, the first clusterincludes the defect data structure, DDS, recorded in a defect managementarea, DMA, the DDS including at least one pointer to information in theDMA.
 17. The recording medium of claim 16, wherein if the recordingmedium is closed, a first sector of the first cluster includes thedefect data structure, DDS, recorded in a defect management area, DMA.18. The recording medium of claim 17, wherein if the recording medium isclosed, each sector of the first cluster includes the defect datastructure, DDS, recorded in a defect management area, DMA.
 19. Therecording medium of claim 1, wherein the TAI area indicates which of theTDMAs are completely used.
 20. The recording medium of claim 19, whereinthe TAI area indicates whether the recording medium is closed.
 21. Therecording medium of claim 1, wherein the TAI area indicates whether therecording medium is closed.
 22. A write-once recording medium having adata structure for managing temporary defect management areas, TDMAs, ofthe recording medium, the recording medium comprising: TDMA0 to TDMAnfor storing management information; and a TDMA access indicator, TAI,area including a second to (n+1)th cluster of the TDMA0, the second to(n+1)th cluster corresponding to TDMAn to TDMA1, and if one of the TDMAnto TDMA1 has been used, each sector of the corresponding second to(n+1)th cluster includes a first temporary disc definition structure,TDDS, which is recorded in the corresponding one of the TDMAn to TDMA1,the TDDS including at least one pointer to information in thecorresponding one of the TDMAn to TDMA1.
 23. A method of recording adata structure for managing temporary defect management areas, TDMAs, ofthe recording medium, each TDMA for at least storing temporary defectmanagement information, the method comprising: selectively recordinginformation in a TDMA access indicator, TAI, area of the recordingmedium to indicate which one of the TDMAs is currently in use.
 24. Amethod of determining a temporary defect management area, TDMA, of arecording medium currently in use, each TDMA for at least storingtemporary defect management information, the method comprising:accessing a TDMA access indicator, TAI, area of the recording medium;and determining the TDMA currently in use based on the accessing step.25. An apparatus for recording a data structure for managing temporarydefect management areas, TDMAs, of the recording medium, each TDMA forat least storing temporary defect management information, the apparatuscomprising: a driver for driving an optical recording device to recorddata on the recording medium; a controller for controlling the driver toselectively recording information in a TDMA access indicator, TAI, areaof the recording medium to indicate which one of the TDMAs is currentlyin use.
 26. An apparatus for determining a temporary defect managementarea, TDMA, of a recording medium currently in use, each TDMA for atleast storing temporary defect management information, the apparatuscomprising: a driver for driving an optical recording device toreproduce data from the recording medium; a controller for controllingthe driver to access a TDMA access indicator, TAI, area of the recordingmedium, and for determining the TDMA currently in use based on theaccessing.